Bonus tax calculator (2026)
Most employers withhold federal tax on bonuses at a flat 22% (the IRS optional rate for supplemental wages under $1 million), then add Social Security, Medicare and state tax.
Estimated bonus take-home
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Withheld isn't owed. A flat 22% can be more or less than your real tax rate, and the difference is settled on your tax return. Some employers instead add the bonus to a regular paycheck (the aggregate method), which can withhold more on that check.